/*
 * MIT License
 *
 * Copyright (c) 2019-2021 JetBrains s.r.o.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.jetbrains.projector.server.core.util

import org.xbill.DNS.Address
import java.net.InetAddress
import java.net.UnknownHostException

public fun getHostName(address: InetAddress): String? {
  return try {
    // The trailing '.' makes the name into a "Fully Qualified Domain Name", i.e. an absolute domain name.
    // dnsjava adds the trailing dot, but for our purpose we don't need it
    Address.getHostName(address).trimEnd('.')
  }
  catch (e: UnknownHostException) {
    address.hostAddress
  }
}
